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Unformatted text preview: Chapter 9 1 Chapter 9 Testing Hypotheses Overview Research and null hypotheses One and two-tailed tests Errors Testing the difference between two means t tests Chapter 9 2 Interval Nominal Dependent Variable Independent Variables Nominal Interval Considers the difference between the mean of one group on a variable with another group Considers how a change in a variable affects a discrete outcome Considers the degree to which a change in one variable results in a change in another TODAY! Testing the differences between groups Overview Considers the distribution of one variable across the categories of another variable Chapter 9 3 General Examples Interval Nominal Dependent Variable Independent Variables Nominal Interval Interval Nominal Dependent Variable Independent Variables Nominal Interval Interval Nominal Dependent Variable Independent Variables Nominal Interval Is one group scoring significantly higher on average than another group? Is a group statistically different from another on a particular dimension? Is Group As mean higher than Group Bs? Chapter 9 4 Specific Examples Interval Nominal Dependent Variable Independent Variables Nominal Interval Interval Nominal Dependent Variable Independent Variables Nominal Interval Interval Nominal Dependent Variable Independent Variables Nominal Interval Do people living in rural communities live longer than those in urban or suburban areas? Do students from private high schools perform better in college than those from public high schools? Is the average number of years with an employer lower or higher for large firms (over 100 employees) compared to those with fewer than 100 employees? Chapter 9 5 Statistical hypothesis testing A procedure that allows us to evaluate hypotheses about population parameters based on sample statistics....
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